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sunspot cycle

noun, Astronomy.
the cycle, averaging in duration slightly more than 11 years, in which the frequency of sunspots varies from a maximum to a minimum and back to a maximum again.
Compare solar cycle. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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  • Also the present sunspot cycle started its rise to maximum about 1954.

    Disturbing Sun Robert Shirley Richardson
  • The sunspot cycle has appeared to average 11.2 years in length, and has been called the 11-year cycle.

    Climatic Changes Ellsworth Huntington

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